Carburetor



June 21 1927. 1,633,429

c. B. ALLEN CARBURETOR Fil ed Oct. 21; 1924 Patented June 21, 1927.

UNITEDSTATES PATENT OFFICE.

CHARLES B. ALLEN, OF ATLANTA, GEORGIA...

GABBURETOB;

Application filed. October 21, 1924. Serial No. 744,995.

It is the purpose of the present invention to provide, in a carburetor,a construction including a vacuum chamber, together with a gasoline orfuel control by which the asoline can'be sprayed into the vacuum 0 ambertogether with a mixture of gasoline andset forth, shown in the drawingsand claimed. Y In the drawings:

Figure 1 is a vertical. sectional view through the improved carburetordisclosing the preferred embodiment of the invention, wherein thecarburetor now used is dispensed with.

' Figure 2 is a vertical sectional view show ing an auxiliary carburetorconstruction in connection with th'epresent form of carburetor, wherebyan additional volatilized mixture maybe drawn into the intake manifoldwith the ordinary ,supply from the carburetor now use d; r

Referringto, the drawings, 1 desi ates a casing which may be any shapean proportions and is adapted to receive a supply of gasoline indicatedat 2, with its level shown at 3. Arranged above the carburetor casinglis a globular casing 4 about which the wall of an exhaust manifold 5 isconstructed, thereby supplying heat to the wall of the casing 4. Thecasing 4 defines a combined mixing and vacuum chamber 6 which isoperatively connected by means of a tube or pipe 7 w1th the cylinders ofthe engine. A suitable air supply pipe 8 is provided. This pipe extendsthrough the top of the carburetor casing 1 and terminates n an inlet end9 at a point adjacent the bottom, of the casing 1' and below the level 3of the gasoline. The other end of the pipe 8 terminates in a funnel 10which is provided with a Wire fabric or screen covering 11 to precludedust, dirt and other foreign matter from entering the pipe. This funnelis disposed so that air will enter the pipe 8 and be conducted to apoint below the level of the gasoline in the casing 1. The airthenpercolates through the asoline withwhich it becomes saturated and risesin the chamber 12 above the level of the gasoline.

The pipe 8 passes through a. suitable packmg gland 13* toi-nsure theprevention of the escape of the mixture of air and gasoline.

The casing 4 connects witli'a pipe 14 which passes through "a packinggland 15 on the top of the casing 1 its terminal 16 line. The pipe 14below and this pipe 14 also has the level 3 of the gasois provided witha fuel valve 17 at a point above the level of the gasoline for ad ustingthe feed of gasoline, and its operatlng shaft 18 passes through asuitable packing gland 19 carried by the wall of" the casing 1. Thisoperating shaft.

or rod 18 has an arm/20 to which an opera latingrod- 21 is connected,whereby thefuel valve may ed o terminate in suitable means (not shown)to be located adjacent the instrument-board ofan' automobile, convenientto a chauffeur or operator, whereby the supply of gasoline may becontrolled through the pipe 14 to the mixing or vacuum chamber. v

The pipe 14 has an air intake opening or port 22 ata point above thevalve 17. This opening or port is provided for the purpose of permittinga mixture of gasoline and air .taken from the surface of the level ofthe gasoline, to pass through the pipe 14 into the vacuum or mixingchamber 6.

When the engine is at rest, a substantial supply of the mixture of thegasoline and air is collected in c amber 6. This the mixing or vacuumsupply being rich and capable of combustion, upon the initial strokes ofthe engine piston creating suction in the chamber 6, is drawn 011', thatis, while the fuel valve on the pipe 14 is closed. As

this collected supply diminishes, the subse quent supply drawn into thechamber 6 as a result of the intake strokes piston gradually becomes ofthe engine weaker and hence too lean for combustion.

However,

in using the present type of carburetor, it is not the aim to use upthis collectedsupply until it becomes so Weak that it will not ignite.In fact, it is the purpose to open the fuel valve 17 before thiscollected supply diminishes to such a condi tion. In this case, thesuction created in the chamber 6 by the successi results in acombustible ve intake strokes, mixture belng '70. be operated. The rod21 is adaptsprayed into the chamber 6 from which it is drawn into theintake manifold and thence into the cylinders of the engine.

The casing 1 is provided with a suitable gasoline feed pipe '22 line tothe casing.

This pipe 22 has a valve for supplying gaso with the usual intakemanifold 24:, said pipe line being designated In this construction, thelevel'of the gasoline the gasoline is indicated at 26 and the casing 27has an air intake pipe 28 extending thereinto and terminating at a pointbelow the level 26 of the gasoline, there being apipe line or tube29,entering the casing 27 and connecting the intake manifold 24, as at30. The pipe line 25 is for the purpose of equalizing the level ofgasoline in'the casing 27 and in the carburetor, the normal level beingas indicated at 26. The supply of air enters the casing 27 andescapesbelow the level of the gasoline to permit it to be saturated with andcollect in the chamber above the level of" the gasoline. This mixture ofgasoline and air is drawn through the pipe line 29, into the intakemanifold and thence into the combustion chamber of the engine. The pipe29 has an enlarged globular portion 31 defining a vacuum chamber 32which corresponds to the chamber 6. However, this enlarged portion maybe dispensed with, if so desired.

35 The pipe 7 is provided with a butterfly by the numeral 25.

' ing through the arm 7 and terminates in any suitable op-' eratingmeans (not shown) to be located adjacent the instrument-board of anautomobile convenient to the chauffeur or operator,

enabling the butterfly throttle valve to be actuated for regulating thesupply of mixture to the combustion chamber.

The invention having been set forth, what is claimed is: Y

A carburetor comprising a casing defining a fuel chamber and havingfuelsupply meansconnected therewith, a pipe extendthe casing and alsoterminating adjacent the the top of the caslngand terminating short ofthe bottom thereof andv bottom thereof, said second pipe having an Iangular bend terminating in a funnel to provide an air said pipe beingprovided with a lateral port directly above the plane of the fuel valve.

In testimony whereof he aflixes his signature.

CHARLES B. ALLEN.

supply to the casing, the first

